Tool-holder.



No. 373,953. PATENTBD DBC. 17, 19o?.

' Wl Bs A TOOL HOLDER.

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UNITED STATES PATENT OFFICE.

WALTER B. MEHL,4OF WALTHAM, MASSACHUSETTS, ASSI-GN OR OF ON E-HALF TO WILLIAM H.

SAWTELLE, OF WALTHAM, MASSACHUSETTS.

TOOL-HOLDER.

Specification of Letters Patent.

Patented Dec. 17, 1907'.

Application filed September 7,1906. Serial No. 333.652.

To all whom it may concern:

Be it known that I, WALTER B. MEHL, of Waltham, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Im rovements in Tool- Holders, of which the fol owing is a specification.

The present invention relates to tool holders, and particularly to those adapted for use upon lathes.

It has for its principal objects the provision of a simple and strong device of this character, to which a tool may be readily applied, and the vertical position of its cut- In the accompanying drawings, in which similar characters designate like parts throughout the several views: Figure 1 is a front elevation of one embodiment of the invention. Fig. 2 is a 4vertical section on the line 2-2 of Fig. 1. Fig. 3 is a horizontal section on the line 3-3 of Fig. 1. Fig. 4 is a vertical sectional detail on the line 4-4 of Fig. 3. Fig. 5 is a front elevation of another form of the invention. Fig. 6 is a side elevation thereof, and Fig. 7 is a horizontal section on the line 7`7 of Fig. 5.

At S is indicated a portion of a slide rest of the usual form, having the customary T-slot s. The slide rest is adapted to support the base 10 of myimproved tool holder. This has at its center an opening 11 to permit the passage of a bolt 12, the elongated. head 13 of which lies in the slot s. Rising from the base upon opposite sides of the bolt are posts 14 14, which guide and retain against rotation about the bolt a clamping member 15, which is elongated in its horizontal dimension in the plane of the posts and provided with vertical openings 16 16 to receive them ese openings preferably do not extend through the top of the clamping member, thus preventing the ingress' 'of particles which will `tend to produce wear. The clamping member also has an intermediate opening 1 7, through which the bolt 12 passes, and said bolt has at its upper threaded end a nut 18, which may be rotated by a sliding bar 19. The contact shoulder 20 of the nut is shown as cooperating with a washer 21, interposed between it and the clamping member, the latter being forced toward the base by the pressure of the nut.

The clamping member is recessed at one side to receive a tool T, the overhanging porj tion 22 above the recessbeing preferably provided with a hardened projection23 for contact with the tool. The inner wall of the recess is so located that the clamping member openings 16 16 extend through it and permit the posts to project into the recess, thus furnishing a lateral and relatively fixed support for the tool, independently of the clamping member. In the base, beneath the overhanging portion 22, is a groove or seat 24 extending parallel to the wall of the recess, and being of concave form. This slot receives a supporter rocker 24, the under face of which conforms to the slot, while the top resents a plane surface, upon which the un( er side of the tool rests. When the nut is turned down against the clamping member, the contact projection is forced against the tool,'fixing it in place upon the rocker. The position of the latter in its slot determines the angle at which the tool shall lie and therefore the height of its working portion, at the same time the head. of the bolt is drawn against the inner surface of the slot in the slide rest, thus clamping the base in place.

The bolt opening 17 may be enlarged at 25 to furnish a cylindrical recess, in which is situated a spring 26. This spring normally forces the clamping member from the base, causing it' to rise when the nut is loosened, and therefore leaving the tool free for removal.

It will be observed that the posts 14 are considerably elongated above the base 10, and that the post-receiving openings 16 formed in the clamping member are of considerable depth so that, although the posts are rigidly fixed to the base, the clamping member may have a considerable range of vertical adjustment without becoming separated from the posts. This enables tools of widely varying sizes to be clamped between the overhanging portion, or jaw 22, of the clamping member and the rocker 24a.

In the form of the invention illustrated in Figs. 5 to 7, the base with its central opening, the concave recess, the supporting rocker, and the bolt and its nut are substantially the same as in the embodiment previously described. Here, however, the clamping member 27 is cylindrical, and moves within an external guide socket 28. This socket is somewhat more than semi-cylindrical, so that it embraces the clamping member sufliciently to prevent its lateral movement, yet

gives free access to the tool recess 29 in the clamping member. The rotation of the clamping member is prevented and it is held in its proper relation to the guide, by a projection 30 upon the former, movable in a slot 81 in the latter. Instead of the projection 23, the overhanging portion of the tool recess is convexed at 32, to permit the angular movement of the tool with the rocker. In this arrangement the tool finds its lateral support against the edges 33 33 of the guide.

It is thought that the use of the holder will be clear from the above description.

It should be particularly noted that whatever the size of the cutting portion of the tool, it can be quickly applied to the holder without the necessity for inserting the end of the shank through a contracted opening. The angle of the tool may be readily varied to control its relation to the center of the work. The movable clamping member is not rotatable as is the case with the ordinary tool post screw, and no difficulty can arise from crushing and distorting it. A relatively xed lateral su port for the tool is provided independent o the clamping member, thus more definitely fixing its position and avoiding friction. 1

Having thus described my invention, I claim:

l. A tool holder comprising a base having a flat under surface for direct support by the slide rest of a lathe and having elongated posts rising therefrom, a bolt extending through the base, a clamping member surrounding the bolt and having post-receiving openings and being recessed at one side to receive a tool between an overhanging portion of said clamping member and the base, said post-receiving openings being deep to permit different sized tools to be clamped without disengagement from the posts, and a nut upon the bolt cooperating with the clamping member.

2. A tool holder comprising a base having a flat unden surface for direct support by the slide rest of a lathe and having elongated posts rising therefrom, a bolt extending through the base, a clamping member surrounding the bolt and having post-receiving openings and having an intermediate opening to receive the said bolt, the lower portion of said intermediate opening being enlarged, the said clamping member being recessed at one side to receive a tool between the overhanging portion of said clamping member and the base, said post-receiving openings being adapted to permit different sized too s to be clamped without disengagement from the posts, a nut upon the bolt cooperating with the clamping member, and a spring surrounding the bolt and located in the enlargement of the intermediate opening of the clamping member.

3. A tool holder comprising a base, a guide member rising from the base, a clamping member operatin upon the guide member and having a too recess beyond which the guide member extends to give lateral support to the tool, and means for drawing the clamping memberI and base toward one another.

4. A tool holder comprising a base, separated posts rising from the base, a clamping member having openings into which the posts pass, and means for drawing the clampingl member and base toward one another.

5. A tool holder comprising a base, a member rising from the base, a clamping member having an opening to receive said base member and also being provided with a recess for the reception of a tool, the opening extending through the wall of the recess to allow contact between the tool and the base member, and means for drawing the clamping member and base toward one another.

6. A tool holder comprising a base, separated posts rising from the base, a clamping member having openings into which the posts pass and a recess for the reception of a tool, the openings extending through the wall of the recess to allow contact between the tool and the posts, a bolt passing through the base and clamping member, and a nut upon 'he bolt cooperating with the clamping mem- In testimony whereof I have aflixed my signature, in presence of two witnesses.

WALTER B. MEHL.

IITitnesses E. InvING Locxn, W. B. HUGHES. 

